Adding-machine.



No. 666,499. Pmmd 1an. 22, |901.

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ADDING IAGHINE.

'(Applictipn mod Apr. ne, 1900.) (No Model.) .2 Sheath-Sheet l.

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No. 666,499. I Patented Ian. 22, |90l. J. H. DAVIS.

ADDING MACHINE.

(Applicltion led Apr. 28, 1900.)

(No Model.) 2 Sheets-Sheet 2.

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UNITED STATES PATENT OFFICE.

JONATHAN H. DAVIS, OF GREENFIELD, MISSOURI.

ADDING-MACHINE.

SPECIFICATION forming-part of Letters Patent N 0. 666,499, dated January 22, 1901.

Application filed April 28, 1900. Serial No. 14,702. (No model.)

To f/.ZZ whom, if; 'rn/Cty concern.-

Be it known that I, JONATHAN I-I. DAVIS, a citizen of the United States, and a resident of Greenfield, in the county of Dade and State of Missouri, have invented a new and Improved Adding-Machine, of which the following is a full, clear, and exact description.

This invention relates to improvements in devices for mechanically adding Afigures; and the object is to provide a machine of this character that shall be simple in construction, having no parts liable to get out of order, that may be sold for a comparatively small price, and by means of which a column of figures may be quickly and accurately added without mental exertion on the part of the operator.

I will describe an adding-machine embodying my invention and then point out the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure l is a partial elevation and partial section 011 the line of Fig. 3 of an addingmachine embodying my invention. Fig. 2is a section on the line y y of Fig. 3; and Fig. 3 is a plan View, parts being broken away and in section.

Referring to the drawings, l designates the base of the machine, upon which are mounted a casing 2 and a casing 3. Extended through the casing 3 is an operating-shaft 4a, and extended through the casing 2 is a shaft 4b, and mounted on the shaft 4b, within the casing 2, so as to rotate therewith, is the adding-cylinder 4. The outer surface of this adding-cylinder has a continuous raised spiral 5, the turns of which are separated by a spiral channel 6, the purpose of which will be hereinafter described. On the spiral surface 5 figures 7 are arranged, the said figures being in consecutive order from naught to any desired limit.

Attached to one end of the cylinder 4 is a ratchet-wheel S, adapted to be engaged by a pawl 9, mounted on a stud l0, arranged in a boxing ll, mounted to rotate freely on the shaft 4a. An arm 12, extended at substantially right angles to the body portion of the pawl, has a link connection 13 with an arm 14,attached to the shaft 4,and a return-spring l5 is attached at one end to said shaft, while the opposite end engages with the casing 3, as clearly indicated in Figs. l and 3. A stopspring 16 is attached to the base l and is designed to engage with the teeth of the ratchet- Wheel 8 to prevent an accidental overthrow of the cylinder or backward motion thereof.

Arranged to slide on a rod 17, extended lengthwise ot' an opening I8 in the casing 2, is an indicating-plate 19, having an opening 20, through which the numbers on the cylinder are disclosed. On the inner side of this indicating-plate is a lug 2l, which engages in the spiral channel 6. Connected to the shaft 4a, within the casing portion 3, is aseries of plates 22,which are cam-shaped or rounded on their under sides, and coacting with each plate 22 is a {niger-lever 23. On the inner end of each finger-lever is pivoted a pushplate 24, which extends upward and has a pin 25, adapted to engage in a notch 26 in its plate 22, and these push-plates 24'are held yieldingly toward the plates 22 by means of springs 27, connecting at one end with said plates 24 and at the other end with a fixed bar 28. The linger-levers are here shown as nine in number, and the number of each lever is indicated on the finger-pieces, as plainly shown in Fig. 3.

It is designed that a different degree of rotation of the cylinder 4 shall take place upon a movement of the different keys-that is, when the lever bearing the numeral l is operated it will rotate the cylinder from one ligure of the cylinder to the next figure in order on the cylinder. Should the lever having the numeral 4 be operated, it will move the cylinder through the space offour figures, and this is continued throughout the whole series. It is tofbe understood, however, that while I have shown nine linger-levers a greater number may be employed, if desired. To provide for this different throwing of the several levers, they are variously fulcrumed on posts 29,as shown in Fig. 3.

A boxing 30 is mounted on the base l forward of the casing 2, and in this boxing 30 is mounted to slide a number of plates 3l, 011 each one of which numbers are printed extending from 0 to 9. Knobs or lingerpieces 32 extend from the plates 3l through IOO slots in the top of the boxing 30, and at the inner ends of these slots are sight-openings 33, through which the numbers on the pla-tes 3l ma)` be observed, as will be hereinafter described. It will be noted that the plates 3l are equal in number to the convolutions on the cylinder et. These plates 3l are designed to record the last figure of the total addition of a line in a column.

The operation of the machine is as follows: First set the indicating-plate l0 at zero appearing on the first convolution of the spiral raised portion. This may be done by lifting or rather swinging it or clear the lug 21 from the spiral channel and then moving the plate along the rod 17. The cylinder may be rotated to bring zero or naught into the sightopening of the plate. New the right-hand line of a column of figures is to be added by touching the keys corresponding` to figures as they appearin theline. When all of the gures of the line have been added, the total result will beindicated on the cylinder. Then record the last figure of the total sum by the first sliding plate al. Next set the ind e); at the number on the cylinder that is to be oarricd or added to the next column. This is easily done by lifting the index-plate, nieving it to the left, and revolving the cylinder back or forward until the number appears in the opening of the plate. After thus setting the machine the operator is ready to add the next column. When this column is added, record the last ligure thereof by moving` the second slide to bring the proper number in the sight-opening 33, and this operation is carried out through the several lines of a column of figures. The total result may be read from the cylinder through the sightopening 20 and also from the numbers on the slides all showing through the sight-openings 33. I have shown five sight-openings 33, this being sufficient for six lines of guresin a column. If more lines are to be added, first add five lilies, then enter the figures shown on the slides in aledger or book containing the columns of figures, pull the slides 3l back, and proceed to add the additional columns, as before described.

In certain instances it is not necessary to touch all the keys in adding small figures. For example, three and five may be added by touching the key 8. Two, three, and four may be added by touching the key 9. It may be here mentioned that the number of teeth on the ratchet-wheel S should be equal to the number of figures on one spiral of the cylinder 4:.

Upon operating one of the fin ger-levers motion will be imparted to the shaft a, as before described, by means of the plates 22 and 2a and the pin 25, engaging in the notch 26. The otherlevers,however, willremain idle,because the plates of said other levers will move from the notches out of engagement with the pins 25, and these pins 25 will engage against the cam edges of said plates 22, forcing the upper ends of the plates 22 underneath a stopplate 34:, attached to the back plate of the casi ng 3, thus preventing any possible upward movement of the inner ends of said other le vers. Upon releasing the operated key the shaft e will be returned to its normal position and of course bring all the plates 22 to their normal position.

It will be seen that a machine embodying my invention is very simple in its construction, takes up very little room on a desk or table, and is easily operated. Furthermore, there is no possible chance of making an error in the addition, provided the proper number is carried forward to the next line of a column.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. An adding-machine, comprising a shaft, a cylinder mounted to rotate relatively to said shaft, means for causing the cylinder to rotate with the shaft, said cylinder having on its outer side a spiral raised portion provided with figures arranged in consecutive order, a sliding indicating-plate having a sight-opening, a part carried by said plate and adapted to engage in the spiral channel of the cylinder, a series of plates mounted on the shaft, and finger-levers for engaging with the plates to rotate said cylinder to different degrees of rotation, substantially as specified.

2. An adding-machine, comprising a shaft, a cylinder mounted to rotate and having a spirally-disposed row of figures on its outer surface, an indicating-plate movable along said cylinder, a series of plates attached to the shaft, an arm mounted on the shaft, a pawl operated by the arm, a ratchet-wheel on said cylinder and adapted to be engaged by said pawl, and a finger-lever for ooacting with each of said plates on the shaft, substantially as specified.

3. An adding-machine, comprising a shaft, a cylinder mounted to rotate and having a spirally-disposed row of figures on its outer surface, an indicator movable lengthwise of said cylinder, a ratchet-wheel on one end of the cylinder, an arm having spring yielding connection with the shaft, apawl operated by said arm for engaging with the ratchetwheel, a series of notched plates mounted on said shaft, each plate having its lower edge curved or cam-shaped, fngerlevers fulcrumed at different distances from the shaft, push-plates mounted on said finger-levers, and pins on said push-plates adapted to e11- gage in the notches of the plates on the shaft, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JONATHAN H. DAVIS.

Witnesses:

JNO. M. RITTER, C. R. FERGUSON.

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